Bottom line is that you have to convert to right hand drive, which I'm guessing is next to impossible. There are special exemptions but I think the only one we'd ever have a chance at is waiting till the car is 20+ years old.
My wife is a kiwi and I looked into this a few years back when facing a layoff and contemplated moving to NZ.
https://www.nzta.govt.nz/vehicles/im...drive-vehicle/